Discostella Lakuskarluki Guide
  1. Valves < 7 μm in diameter
  2. Striae cover 50-70% of valve radius
  3. Central rosette present, or absent

Cells are less than 7 μm in diameter. The striae on the valve face extend along 50–70% of the valve radius. A central rosette of alveoli is variable, as it may be present or absent. About half to one-third of all costae separating the alveoli bifurcate on the valve face. 3–5 marginal fultoportulae are present.